Stability of the magnetopause

Details Stability of the magnetopause Stability of the magnetopause

Sep 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976ap%26ss..43..433k&link_type=abstract

Astrophysics and Space Science, vol. 43, Sept. 1976, p. 433-448.

Physics

1

Atmospheric Physics, Boundary Layers, Collisionless Plasmas, Dynamic Stability, Magnetopause, Solar Wind, Lines Of Force, Magnetohydrodynamic Stability

Scientific paper

The stability of the magnetopause is investigated by analyzing the stability toward a general perturbation of a surface separating two collisionless plasmas moving relative to each other. 'Double adiabatic' equations are used to describe the collisionless solar-wind and magnetospheric plasmas, a general dispersion equation is derived, and the special case of a tangential discontinuity in identical media is examined. Characteristic parameters of the magnetotail region are employed to carry out a detailed numerical analysis of the stability of the boundary between the magnetosphere and the solar wind. The results show that even a boundary which is stable toward a perturbation propagating parallel to the magnetic-field lines at any shear speed will be rendered unstable in some velocity domain by propagation perpendicular to the field lines.

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